robust

Said of a system that has demonstrated an
ability to recover gracefully from the whole range of exceptional
inputs and situations in a given environment. One step below
bulletproof. Carries the additional connotation of elegance
in addition to just careful attention to detail. Compare
smart, oppose brittle.

Syn. -- Strong; lusty; sinewy; sturdy; muscular; hale; hearty; vigorous; forceful; sound. -- Robust, Strong. Robust means, literally, made of oak, and hence implies great compactness and toughness of muscle, connected with a thick-set frame and great powers of endurance. Strong denotes the power of exerting great physical force. The robust man can bear heat or cold, excess or privation, and toil on through every kind of hardship; the strong man can lift a great weight, can give a heavy blow, and a hard gripe. "Robust, tough sinews bred to toil." Cowper.

Then 'gan the villain wax so fierce and strong,
That nothing may sustain his furious force.
Spenser.